package com.itheima.reggie.fiter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.annotation.processing.Filer;
import javax.lang.model.element.Element;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.tools.FileObject;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import java.io.IOException;

//检查用户是否已经完成登录
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //servlet请求
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        //请求响应
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1获取本次请求的uri
        String requestURI = request.getRequestURI();
        log.info("拦截请求:{}", requestURI);
        //定义不需要处理的请求路径
        String[] uris = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/login",
                "/user/sendMsg",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2,判断本次请求是否需要处理
        boolean check = check(uris, requestURI);
        //3,判断是否放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录", request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            return;
        }//判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户没有登录");
        response.getWriter().write(JSON.toJSONString(R.error("用户没有登录")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     *
     * @param uris
     * @param requestURI
     * @return
     */
    private boolean check(String[] uris, String requestURI) {
        //增强for
        for (String url : uris) {
            //路径映射器对比
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }

}

